Aff is a very pretty and gorgeous girl. I reckon with her black hair, she retains the beautiful Thai look. In her jet black hair, she is an ambassador for the Thai ladies. In her highlighted and dyed brown hair, Aff is sensual and has a very soft feminine look. This look however is so common in other parts of Asia and she sort of becomes part of the fashion trend.
However, it really does not matter - stars are in the entertainment industry - and they are trend setters, models and many more. So, looks are such a vital part in this industry that constant change to her look is good I reckon. Very refreshing in my opinion.